Life goes by so fast. One day you're buying your kids dolls and toy race cars for Christmas and, before you know it, they're buying dolls and toy cars for their kids.

Fortunately, technology has made it so easy to capture your memories. Just take out your smartphone to take photos or videos, then post them online.

But, how often do you look back on those memories? When you do get the chance to look back, it can be a challenge to dig through all your photos, videos, and social media posts.

There's an app called Timehop that takes that challenge out of your hands. It finds your social media posts from this day in years past. Have you ever seen someone post a #TBT, Throwback Thursday, picture on Facebook?

Timehop is the same concept. It finds your old photos posted to social media sites, also including Twitter, Instagram, and others.

Timehop shares your old posts with just you. They don't share it with anyone else, including third-party advertisers. But you can share your Timehop memories with your family and friends. Except, of course, if what you were doing a year ago was embarrassing.